12666645 has 16 divisors (see below), whose sum is σ = 22518720. Its totient is φ = 6755472.

The previous prime is 12666607. The next prime is 12666671. The reversal of 12666645 is 54666621.

It is a happy number.

It is not a de Polignac number, because 12666645 - 2⁷ = 12666517 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46779 + ... + 47048.

It is an arithmetic number, because the mean of its divisors is an integer number (1407420).

Almost surely, 2^12666645 is an apocalyptic number.

12666645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12666645 is a deficient number, since it is larger than the sum of its proper divisors (9852075).

12666645 is an equidigital number, since it uses as much as digits as its factorization.

12666645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93841 (or 93835 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 12666645 is about 3559.0230401052. The cubic root of 12666645 is about 233.1062223278.

The spelling of 12666645 in words is "twelve million, six hundred sixty-six thousand, six hundred forty-five".